Rotorcraft configuration

Abstract

This invention is about a rotorcraft that possesses a configuration made up of the join of three technologies Know separately as Jet Tip, Circulation Control and Advancing Blade Concept. These three technologies synergizes of unusual form allowing the embodiment of a rotorcraft with advantages qualitative and quantitative in fields as flight characteristics, manufacturing, maintenance, security in flight and operational costs.

Claims

1. A rotorcraft Characterized by possess two rotors superimposed, coaxially and contra rotating, with a hollow shaft (4) for both rotors; this shaft is part of a duct that carry air compressed; at bottom shaft is connected a hose (2) from the compressor (1), at top shaft is sealed and at level hubs (5), the shaft has a wall holes, whereby air through from inner shaft toward blade ducts (11) and (12) ejecting a part of air by the tip nozzle (15), for propulsion the blade into rotation as Jet Tip; the remaining air is ejected by a thin slot (13) along span blade on upper rounded trailing edge (14) like a thin air sheet, tangentially at trailing edge, creating Coanda effect, and thereby materializing the Circulation Control at the blades.

2. A rotorcraft as claim 1 characterized by possess a feed source of compressed air that consist in a reservoir of high pressure gas (7) connected at hollow shaft through a valve (8) that will open on emergency situations.

3. A rotorcraft as claim 1 Characterised by possess a command in roll and pitch, X and Y axis, controlled by tilt the shaft, through a gimbaled joint (3). This joint do not has free degree on Z axis, avoiding the rotation and displacement on Z axis.

4. A rotorcraft as claim 1 Characterised by possess a shaft or mast (4) stationary, without rotation on Z axis, turning the two hubs around it, in coaxial way.

5. A rotorcraft as Claim 1 and 4 Characterized by possess at top of its stationary mast, one casing (10) with at least one ballistic parachute, to use as last choice in emergency situations.

6. A rotorcraft as Claim 1 Characterized by possess a tail boom of elliptic section with double effect of Circulation Control, by double slot, at trailing edge, ejecting flow of differentially way, turning CW or CCW on Z axis, to achieve yaw control.

7. A rotorcraft as Claim 1 and 4 Characterized by possess between each hub and the mast, one clutch, disposed in order to transfer rotational momentum in Z axis from one of the rotors at the mast, allowing the control in yaw of the aircraft.

8. A rotorcraft as Claim 1 Characterized by possess longitudinally into the blade a spar beam, dividing the original duct into two ducts one forward (11) dedicated exclusively for feed the Jet Tip nozzle and the rearward duct (12) exclusively for feed the Circulation Control by the slot along the trailing edge.

9. A rotorcraft as Claim 1 Characterised by to have a blade with at least one valve within, in order to control the air flow of any of the inner ducts.

Description

DRAWINGS

[0021] At only effect illustrative but not limitative of possible variations of embodiments, is illustrated as

[0022] FIG. 1: Show an axonometric embodiment of three technologies JT, CC and ABC.1) Compressor.2) Flexible duct.3) Gimbaled mechanism that allow tilt the mast in two axes.4) Mast of the rotors,5) Hubs of rotors.6) Rotor Blades.7) High pressure gas reservoir for emergency use.8) Valve for command the exit from reservoir gas.9) Structure linking the mast and airframe.10) Casing of ballistic parachute used in emergency situations

[0023] FIG. 2: Show a blade axonometric cutaway with its section11) Air duct for Jet Tip propulsion blade.12) Air duct for Circulation Control Supply.13) Air slot ejection to create Circulation Control by Coanda effect on the rounded trailing edge.14) Trailing edge of rounded section by Coanda effect.15) Jet Tip nozzle.16) Blade structural spar.